Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
  • H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
  • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
  • H04N19/103—Selection of coding mode or of prediction mode
  • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
  • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
  • H04N19/184—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being bits, e.g. of the compressed video stream
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
  • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
  • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
  • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
  • H04N19/187—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a scalable video layer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/46—Embedding additional information in the video signal during the compression process
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
  • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
  • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards

Definitions

• the present principles relate generally to video encoding and decoding and, more particularly, to methods and apparatus for inter-layer residue prediction for scalable video
• Bit depth which is also interchangeably known as “color depth” and/or “pixel depth” refers to the number of bits used to hold a pixel The bit depth determines the maximum number of colors that can be displayed at one time
• digital images and/or digital videos with a bit depth greater than eight are more desirable in many application fields including, but not limited to, medical image processing, digital cinema workflows in production and postproduction, home theatre related applications, and so forth
• the first solution is inherently non- compliant with 8-b ⁇ t profiles of the International Organization for Standardization/International Electrotechnical Commission (ISO/IEC) Moving Picture Experts Group-4 (MPEG-4) Part 10 Advanced Video Coding (AVC) standard/International Telecommunication Union, Telecommunication Sector (ITU-T) H 264 recommendation (hereinafter the "MPEG- 4 AVC standard")
• MPEG- 4 AVC standard International Telecommunication Union, Telecommunication Sector
• SVC Scalable video coding
• SVC Scalable video coding
• bit-depth scalable coding over postprocessing or simulcast
• a first advantage is that bit-depth scalable coding enables 10-b ⁇ t video in a backward-compatible manner with the High Profiles of the MEG-4 AVC Standard
• a second advantage is that bit-depth scalable coding enables adaptation to different network bandwidths or device capabilities
• a third advantage of the bit-depth scalable coding is that is provides low complexity, high efficiency and high flexibility
• the prediction block P is obtained using the enhancement layer reference frames and the upsampled motion vectors from base layer, 2
• the corresponding base layer residual block r h is upsampled and
• a smoothing filter with tap [1 ,2, 1] is applied, first in the horizontal direction and then in the vertical direction, to obtain S(P + U ⁇ r h )) , and
• a portion of a decoder using smooth reference prediction is indicated generally by the reference numeral 100
• the decoder portion 100 includes a motion compensator 112 having an output in signal communication with a first non-inverting input of a combiner 132 An output of the combiner 132 is connected in signal communication with an input of a switch 142 A first output of the switch 142 is connected in signal communication with a first non-inverting input of a combiner 162 A second output of the switch 142 is connected in signal communication with an input of a filter 152 An output of the filter 152 is connected in signal communication with the first non-inverting input of the combiner 162
• An output of a reference frame buffer 122 is connected in signal communication with a first input of the motion compensator 1 12
• a second input of the motion compensator 1 12 is available as an input to the decoder portion 100, for receiving enhancement layer motion vectors
• a third input of the motion compensator 1 12 is available as an input to the decoder portion 100, for receiving upsampled base layer motion vectors
• a second non-inverting input of the combiner 132 is available as an input of the decoder portion 100, for receiving an upsampled base layer residual
• a control input of the switch 142 is available as an input of the decoder portion 100, for receiving a smoothed_reference_flag syntax element
• a second non-inverting input of the combiner 162 is available as an input of the decoder portion 100, for receiving an enhancement layer residual
• An output of the combiner 162 is available as an output of the decoder portion 100, for outputting a reconstructed block R
• an apparatus includes an encoder for encoding a block of a picture by applying inverse tone mapping to an inter-layer residue prediction process for the block The inverse tone mapping is performed in the pixel domain to support bit depth scalability
• a method includes encoding a block of a picture by applying inverse tone mapping to an inter-layer residue prediction process for the block The inverse tone mapping is performed in the pixel domain to support bit depth scalability
• an apparatus includes a decoder for decoding a block of a picture by applying inverse tone mapping to an inter-layer residue prediction process for the block The inverse tone mapping is performed in the pixel domain to support bit depth scalability
• a method includes decoding a block of a picture by applying inverse tone mapping to an inter-layer residue prediction process for the block
• the inverse tone mapping is performed in the pixel domain to support bit depth scalability
• FIG 1 is a block diagram for a portion of a decoder using smooth reference prediction, in accordance with the prior art
• FIG 2 is a block diagram for an exemplary video encoder to which the present principles may be applied, in accordance with an embodiment of the present principles
• FIG 3 is a block diagram for an exemplary decoder to which the present principles may be applied, in accordance with an embodiment of the present 15 principles,
• FIG 4 is a flow diagram for an exemplary method for encoding using inter- layer residual prediction for bit depth scalability, in accordance with an embodiment of the present principles.
• FIG 5 is a flow diagram for an exemplary method for decoding using inter- 0 layer residual prediction for bit depth scalability, in accordance with an embodiment of the present principles
• the present principles are directed to methods and apparatus for inter-layer 5 residue prediction for scalable video
• processor or “controller” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor ("DSP") hardware, read-only memory (“ROM”) for storing software, random access memory (“RAM”), and non-volatile storage
• DSP digital signal processor
• ROM read-only memory
• RAM random access memory
• any switches shown in the figures are conceptual only Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context
• any element expressed as a means for performing a specified function is intended to encompass any way of performing that function including, for example, a) a combination of circuit elements that performs that function or b) software in any form, including, therefore, firmware, microcode or the like, combined with appropriate circuitry for executing that software to perform the function
• the present principles as defined by such claims reside in the fact that the functionalities provided by the various recited means are combined and brought together in the manner which the claims call for It is thus regarded that any means that can provide those functionalities are equivalent to those shown herein
• high level syntax refers to syntax present in the bitstream that resides hierarchically above the macroblock layer
• high level syntax may refer to, but is not limited to, syntax at the slice header level, Supplemental Enhancement Information (SEI) level, Picture Parameter Set (PPS) level, Sequence Parameter Set (SPS) level and Network Abstraction Layer (NAL) unit header level
• SEI Supplemental Enhancement Information
• PPS Picture Parameter Set
• SPS Sequence Parameter Set
• NAL Network Abstraction Layer
• an exemplary video encoder to which the present principles may be applied is indicated generally by the reference numeral 200
• the encoder 200 includes a combiner 205 having an output in signal communication with an input of a transformer 210 An output of the transformer 210 is connected in signal communication with an input of a quantizer 215 An output of the quantizer is connected in signal communication a first input of an entropy coder 220 and an input of an inverse quantizer 225 An output of the inverse quantizer 225 is connected in signal communication with an input of an inverse transformer 230 An output of the inverse transformer 230 is connected in signal communication with a first non-inverting input of a combiner 235 An output of the combiner 235 is connected in signal communication with an input of a loop filter 240 An output of the loop filter 240 is connected in signal communication with a first input of a motion estimator and inter-layer prediction determinator 245 An output of the motion estimator and inter-layer prediction determinator 245 is connected in signal communication with a second input of the entropy coder 220 and an input of a motion compensator 255 An output of the motion compensator 255
• An input of the combiner 205 is available as an input of the encoder 200, for receiving high bit depth pictures
• An input of the upsampler 250 is available as an input of the encoder 200, for receiving a base layer motion vector
• An input of the upsampler 265 is available as an input of the encoder 200, for receiving a low bit depth base layer residual
• An output of the entropy coder 220 is available as an output of the encoder 200, for outputting a bitstream
• an exemplary decoder to which the present principles may be applied is indicated generally by the reference numeral 300
• the decoder 300 includes an entropy decoder 305 having a first output in signal communication with an input of an inverse quantizer 310 An output of the inverse quantizer 310 is connected in signal communication with an input of an inverse transformer 315 An output of the inverse transformer 315 is connected in signal communication with a first non-inverting input of a combiner 320
• a second output of the entropy decoder 305 is connected in signal communication with a first input of a motion compensator 325 An output of the motion compensator 325 is connected in signal communication with an input of a tone mapper 330 An output of the tone mapper 330 is connected in signal communication with a first non-inverting input of a combiner 335 An output of the combiner 335 is connected in signal communication with a first input of a smooth filter 340 An output of the smooth filter 340 is connected in signal communication with an input of an inverse tone mapper 345 An output of the inverse tone mapper 345 is connected in signal communication with a second non-inverting input of the combiner 320
• An output of an upsampler 350 is connected in signal communication with a second non-inverting input of the combiner 335
• An output of an upsampler 355 is connected in signal communication with a second input of the motion compensator 325
• An input of the entropy decoder 305 is available as an input to the decoder 300, for receiving an enhancement layer bitstream
• a third input of the motion compensator 325 is available as an input of the decoder 300, for receiving multiple enhancement layer reference frames
• a second input of the smooth reference filter 340 is available as an input to the decoder 300, for receiving a smooth reference flag
• An input of the upsampler 350 is available as an input to the decoder 300, for receiving a low bit depth base layer residual
• An input of the upsampler 355 is available as an input to the decoder 300, for receiving a base layer motion vector
• An output of the combiner 320 is available as an output of the decoder 300, for outputting pictures
• Bit-depth scalability is potentially useful in consideration of the fact that at some point in the future, conventional 8-b ⁇ t depth and high bit depth digital imaging systems will simultaneously exist in marketplaces
• inverse tone mapping is applied after we add tone mapped motion compensated prediction and upsampled residue from the base layer
• the spatial upsampling factor is 1
• the prediction block P is obtained using the enhancement layer reference frames and then P is tone mapping into base layer, we get
• an exemplary method for encoding using inter-layer residual prediction for bit depth scalability is indicated generally by the reference numeral 400
• the method 400 includes a start block 405 that passes control to a decision block 410
• the decision block 410 determines whether or not to apply inter-layer motion prediction If so, then control is passed to a function block 415 Otherwise, control is passed to a function block 425
• the function block 415 use a base layer motion vector, and passes control to a function block 420.
• the function block 420 upsamples the base layer motion vector, and passes control to a function block 430.
• the function block 425 uses an enhancement layer motion vector, and passes control to the function block 430.
• the function block 430 gets the motion compensated block P, and passes control to a function block 435.
• the function block 435 performs tone mapping on P to obtain a low bit depth T(P), and passes control to a function block 440.
• the function block 440 reads the base layer texture residual r b , and passes control to a function block 445.
• the decision block 450 determines whether or not to apply a smooth reference. If so, the control is passed to a function block 455. Otherwise, control is passed to a function block 460.
• the function block 455 applies the smooth filer on P', and passes control to a function block 460.
• the function block 460 performs inverse tone mapping on P' to obtain a high bit depth prediction T "1 (P'), and passes control to a function block 465.
• the function block 465 subtracts an error value, between the tone mapping and the inverse tone mapping operations, from the high bit depth prediction T 1 (P'), and passes control to a function block 470.
• the prediction block P is obtained using the enhancement layer reference frames and then P is tone mapping into base layer, we get T(P);
• the corresponding base layer residual block r ⁇ is spatially upsampled and U(r h ) is added to P to form T(P) + U(r h ) ;
• an exemplary method for decoding using inter-layer residual prediction for bit depth scalability is indicated generally by the reference numeral 500
• the method 500 includes a start block 505 that passes control to a decision block 510
• the decision block 510 determines whether or not an inter-layer motion prediction flag is set to true If so, then control is passed to a function block 515 Otherwise, control is passed to a function block 525
• the function block 515 reads and entropy decodes a base layer motion vector, and passes control to a function block 520
• the function block 520 upsamples the base layer motion vector, and passes control to a function block 530
• the function block 525 reads and entropy decodes an enhancement layer motion vector, and passes control to the function block 530
• the function block 530 gets the motion compensated block P, and passes control to a function block 535
• the function block 535 performs tone mapping on P to obtain a low bit depth T(P), and passes control to a function block 540
• the function block 540 reads and entropy decodes the base layer texture residual rt > , and passes control to a function block 545
• the decision block 550 determines whether or not a smooth reference flag is set to true If so, the control is passed to a function block 555 Otherwise, control is passed to a function block 560
• the function block 555 applies the smooth filer on P', and passes control to a function block 560
• the function block 560 performs inverse tone mapping on P' to obtain a high bit depth prediction T "1 (P'), and passes control to a function block 565
• the function block 565 adds an error value, between the tone mapping and the inverse tone mapping, to the high bit depth prediction T '1 (P'), and passes control to a function block 567
• the function block 567 reads and entropy decodes the enhancement layer residual r e , and passes control to a function block 570
• the function block 570 The function block 570
• the motion compensated block P can be generated by a motion vector from the enhancement layer if inter-layer motion prediction is not used, or from an upsampled motion vector from the base layer if inter-layer motion prediction is used.
• we allow our techniques to be used for both cases In another embodiment, our techniques can only be combined when inter-layer motion prediction is used If inter-layer motion prediction is not used, bit shift is applied for residue prediction, as in the above references third and fourth prior art approaches
• the schemes of the third and fourth prior art approaches can be switched That is, we can first perform filtering then inverse tone mapping Alternatively, we can first perform inverse tone mapping, then perform filtering
• the filter can be linear, or nonlinear, one dimensional, or two dimensional, and so forth In one example, we can use 3 tap filter [1 2 1], first vertically, then horizontally The filter can also be identical, such that the third prior art procedure is not required
• Another advantage/feature is the apparatus having the encoder as described above, wherein the encoder performs the inter-layer residue prediction process by
• I4 performing motion compensation in an enhancement layer of the picture to obtain an enhancement layer prediction, performing tone mapping on the enhancement layer prediction into a base layer of the picture to obtain a tone mapped motion compensated low bit depth prediction for the block, adding a spatially upsampled residue from the base layer to the tone mapped motion compensated low bit depth prediction for the block to obtain a sum, and performing the inverse tone mapping on the sum into the enhancement layer to obtain a higher bit depth prediction for the block
• Yet another advantage/feature is the apparatus having the encoder as described above, wherein the encoder further performs the inter-layer residue prediction process by applying a smoothing filter to the sum prior to performing the inverse tone mapping The inverse tone mapping is performed on the filtered sum
• Still another advantage/feature is the apparatus having the encoder as described above, wherein at least one of a high level syntax element and a block level syntax element is used to signal any of the tone mapping and the inverse tone mapping
• the apparatus having the encoder as described above, wherein the high level syntax element is comprised in at least one of a slice header, a sequence parameter set, a picture parameter set, a view parameter set, a network abstraction layer unit header, and a supplemental enhancement information message
• Another advantage/feature is the apparatus having the encoder as described above, wherein the encoder further performs the inter-layer residue prediction process by subtracting an error value, between the tone mapping and the inverse tone mapping, from the higher bit depth prediction for the block
• the teachings of the present principles are implemented as a combination of hardware and software
• the software may be implemented as an application program tangibly embodied on a program storage unit
• the application program may be uploaded to, and executed by, a machine comprising any suitable architecture
• the machine is implemented on a computer platform having hardware such as one or more central processing units (“CPU"), a random access memory (“RAM”), and input/output ("I/O") interfaces
• CPU central processing units
• RAM random access memory
• I/O input/output
• the computer platform may also include an operating system and microinstruction code
• the various processes and functions described herein may be either part of the microinstruction code or part of the application program, or any combination thereof, which may be executed by a CPU
• various other peripheral units may be connected to the computer platform such as an additional data storage unit and a printing unit

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